Handle Files > Open With gives extra, broken Demo command

[mikehoffms]

The 2nd command, without the arrow in the icon, fails to load the file; remove.

Repro:

1. Do steps in https://learn.microsoft.com/microsoft-edge/progressive-web-apps/how-to/handle-files#pwa-file-handlers-demo-app
2. At the step: "Right-click the text file (such as test.txt), and then select Open with > PWA file handlers demo."
   Actual: There are 2 commands for the demo:
   
   Expect: There should only be 1 command.
   The first Demo command works ok.
3. Uninstall the PWA.
   Result: 0 commands:
   
4. Re-install PWA.
   Actual: 2 commands.
   Expect: 1 command.
5. Select Open with > use the 2nd Demo command.
   Actual: Get dialog falsely claiming that test.txt is 2 files:
   
   Expect: No dialog; open the PWA.
6. Click the Open button.
   Actual: No file is loaded in app:
   
   Expect: test.txt should be loaded in the app. But, solution: remove the 2nd command, without the arrow in the icon.